81335037 has 16 divisors (see below), whose sum is σ = 125079680. Its totient is φ = 46049472.

The previous prime is 81335011. The next prime is 81335047. The reversal of 81335037 is 73053318.

It is not a de Polignac number, because 81335037 - 2¹⁵ = 81302269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81334995 and 81335013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81335047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15478 + ... + 20055.

It is an arithmetic number, because the mean of its divisors is an integer number (7817480).

Almost surely, 2^81335037 is an apocalyptic number.

It is an amenable number.

81335037 is a deficient number, since it is larger than the sum of its proper divisors (43744643).

81335037 is a wasteful number, since it uses less digits than its factorization.

81335037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35652.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 81335037 is about 9018.5939591491. The cubic root of 81335037 is about 433.2706022933.

The spelling of 81335037 in words is "eighty-one million, three hundred thirty-five thousand, thirty-seven".